I will run MEMTEST. How do I make sure there is enough power? The installed GFX card was a GeForce 750 Ti (upgraded from a GeForce 250), which did require a power input.
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PetahMay 13 '14 at 10:13

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The power requirements are different for every GPU look your up then compare to your PSU
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RamhoundMay 13 '14 at 10:14

My PC boots up fine, its only under load it crashes, so will changing out RAM effect this?
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PetahMay 13 '14 at 10:19

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@Petah - You need to do multiple passes. It should not fail a single pass. Good memory will contain zero errors ( this is because the error correction that exists). So if you have detectable error it means you have more errors then the error correction can resolve.
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RamhoundMay 13 '14 at 10:46